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Next: A. 等価回路 Up: 作図で理解するSRPP Previous: 7 μ フォロワー

8 まとめ

これまでに登場した式のうち,重要なものを再掲しておきます.

上側の真空管の抵抗 Rl' (RL を含む)

Rl' = (rp2//RL)(1 + gm2Rk2) (43)

下側の真空管の負荷 Rl

Rl = Rl' + Rk2 = (rp2//RL)(1 + gm2Rk2) + Rk2 (44)

下側の真空管の電流 i1

i1 = $\displaystyle {\frac{{\micro_1 e_i}}{{r_{p1}+R_l}}}$ (45)

上側の真空管の入力電圧 eg2

eg2 = - i1Rk2 = - μ1ei$\displaystyle {\frac{{R_{k2}}}{{r_{p1}+R_l}}}$ = - μ1ei$\displaystyle {\frac{{R_{k2}}}{{r_{p1}+R_l'+R_{k2}}}}$ (46)

出力電圧 eo

eo = - i1Rl' = - μ1ei$\displaystyle {\frac{{R_l'}}{{r_{p1}+R_l}}}$ = - μ1ei$\displaystyle {\frac{{R_l'}}{{r_{p1}+R_l'+R_{k2}}}}$ (47)

出力電流 io

io = $\displaystyle {\frac{{-e_o}}{{R_L}}}$ = i1$\displaystyle {\frac{{R_l'}}{{R_L}}}$ (48)

上側の真空管の電流 i2

i2 = i1 - io = i1(1 - $\displaystyle {\frac{{R_l'}}{{R_L}}}$) = i1$\displaystyle {\frac{{R_L - R_l'}}{{R_L}}}$ (49)

上側の真空管の負荷 Ru

Ru = $\displaystyle {\frac{{e_o}}{{i_2}}}$ = $\displaystyle {\frac{{R_l'R_L}}{{R_l'-R_L}}}$ (50)

ゲイン A

A = $\displaystyle {\frac{{e_o}}{{e_i}}}$ = - μ1$\displaystyle {\frac{{R_l'}}{{r_{p1}+R_l'+R_{k2}}}}$ (51)

V2が定電流となる負荷

RL = μ2Rk2,    Rk2 = $\displaystyle {\frac{{R_L}}{{\micro_2}}}$ (52)

プッシュプル( i2 = - i1)となる負荷

RL = $\displaystyle {\frac{{\micro_2R_{k2}-r_{p2}}}{{2}}}$,    Rk2 = $\displaystyle {\frac{{2R_L+r_{p2}}}{{\micro_2}}}$ = $\displaystyle {\frac{{2R_L}}{{\micro_2}}}$ + $\displaystyle {\frac{{1}}{{g_{m2}}}}$ (53)


next up previous
Next: A. 等価回路 Up: 作図で理解するSRPP Previous: 7 μ フォロワー

平成16年5月14日